/**
 * Copyright (c) 2016-2019 人人开源 All rights reserved.
 * <p>
 * https://www.renren.io
 * <p>
 * 版权所有，侵权必究！
 */

package io.renren.modules.app.interceptor;


import io.jsonwebtoken.Claims;
import io.renren.common.exception.RRException;
import io.renren.modules.app.utils.JwtUtils;
import io.renren.modules.app.annotation.Login;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 权限(Token)验证
 *
 * @author Mark sunlightcs@gmail.com
 */
@Component
public class AuthorizationInterceptor extends HandlerInterceptorAdapter {
  @Autowired
  private JwtUtils jwtUtils;

  public static final String USER_KEY = "userId";

  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    Login annotation;
    if (handler instanceof HandlerMethod) {
      annotation = ( (HandlerMethod) handler ).getMethodAnnotation(Login.class);
    } else {
      return true;
    }

    if (annotation == null) {
      return true;
    }

    //获取用户凭证
    String token = request.getHeader(jwtUtils.getHeader());
    if (StringUtils.isBlank(token)) {
      token = request.getParameter(jwtUtils.getHeader());
    }

    //凭证为空
    if (StringUtils.isBlank(token)) {
      throw new RRException(jwtUtils.getHeader() + "不能为空", HttpStatus.UNAUTHORIZED.value());
    }

    Claims claims = jwtUtils.getClaimByToken(token);
    if (claims == null || jwtUtils.isTokenExpired(claims.getExpiration())) {
      throw new RRException(jwtUtils.getHeader() + "失效，请重新登录", HttpStatus.UNAUTHORIZED.value());
    }

    //设置userId到request里，后续根据userId，获取用户信息
    request.setAttribute(USER_KEY, Long.parseLong(claims.getSubject()));

    return true;
  }
}
